200ci engine measurements

[Invectivus]

I'm looking into making my purchases for new pistons/rings, head gasket, and cam/crank bearings this week, so i'm trying to figure out what I have.

I haven't had an opportunity to check my cam yet, but when i measured my block and crank, this is what i got:

Bore - ~3.74". book says 3.680, so that looks like 60 over to me.

Deck Height - ~ 7.8". I measured from the bearing cap seat at the front of the block to the top of the block. I can't find a spec for that in my Chilton manual, am i measuring it correctly, and does that sound right? I need to know these things (as well as my chamber size) so i can play with piston/gasket combinations to get a CR and figure out what parts to get.

Stroke - 3.130" (i assume it'll be stock from the book)

Measuring my Crank, I get

Main journal - ~2.238". looks to be 10 under so i'll need oversize bearings.

connecting rod journals - ~ 2.115" also looks 10 under as well.

Does anyone have a suggestion on how to CC a chamber? i assume i need to use a syringe to fill the chamber, tracking how much i drop in, or is there another (better) way?

I've read that overboring a cylinder raises the compression ratio, so I'll probably have to get dished pistons again, but i'll need to run the simulator to tell for sure.

I'm a little confused by the calculator here:
http://falconperformance.sundog.net/compcalculator.asp
But i have the book on order. When i get it, is it going to explain the process a bit, or am i just missing some core knowlege?

-joe

 

[addo]

Don't sweat the "actual" deck height. You need to first buy the correct size bearings; ten under looks to be that.

Have the rods received any work? Are you sure they're still with their correct caps? One fellow here managed to mix-n-match his caps - a recipe for rapid failure if undetected.

Head CCs are explained in a few places. You do need the headwork largely complete first, as perfect valve sealing is required. Install plugs into #1 and #6 for the measuring. The chamber is closed off by slipping a perspex coverplate onto it, with moly grease or vaseline on the surrounding "land" as a seal. This coverplate has two holes - a 1/8" breather, and a 1/4" fill hole.

You use a calibrated vet syringe to draw up 50 ml of ATF and inject it into the chamber via the larger hole. Keep note of either the residual volume in your syringe, or extra needed to completely fill the covered chamber. Of course, this requires the head to be packed level and upside down. Checking both ends of the head will generally give a good "trending".

Now you can play with compression calculators, and see what different deck heights and piston dishes do for you. I'm a big advocate of positive decking, seeing it as effective use of what's offered. Check also, that the intended piston dish is avalable in a piston of the desired type.

 

[page62]

Hold your breath, the book is coming...

In fact, if you hadn't ordered it, I would've recommended your doing so!

 

[Patrick66]

that 3.74" bore would be great for chevy 305 pistons or jeep 258 pistons. http://fordsix.com/forum/viewtopic.php?t=37644